Research progress on kidney transplantation rejection associated with non-HLA antibody

Human leukocyte antigen (HLA) is a product encoded by HLA gene complex, which is located on the short arm of chromosome 6 and is the main target of alloimmunity. However, positive HLA antibody is not responsible for all kinds of rejections in kidney transplantation. Non-HLA antibody is the product of donor gene expression in allogeneic kidney transplantation. Intraoperative ischemia-reperfusion injury, the interaction between alloimmunity and autoimmunity and the mediation of extracellular vesicles may trigger immune system response and promote the production of non-HLA antibody. Multiple studies have demonstrated that non-HLA antibody is an important factor of inducing rejection and affecting the outcomes of kidney transplantation. Consequently, the types and formation mechanism of non-HLA antibody in kidney transplantation were reviewed, and research progress on kidney transplantation rejection associated with non-HLA antibody was summarized, aiming to provide reference for in-depth study of kidney transplantation rejection associated with non-HLA antibody.